Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5502196b91287a8…

MALICIOUS

PDF

78.5 KB Created: 2021-03-28 01:35:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1978565b141d1d925ea5509a93b80bc9 SHA-1: ed28475990ddbe50174d7c2869557f8de43844a0 SHA-256: a5502196b91287a80496fdd989d01197316038ceaccf5c4032e198e9568b4421
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/123?utm_term=ielts+answer+sheet+capital+letters PDF link annotation
    • http://smartline58.ru/archive_25_albumh7v5o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421781/normal_6056b2179c5ed.pdfIn PDF document text
    • http://prizinsta365.online/my_beloved_world_quizletw1azo.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/921e6.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/ruzutim-femokunuz-badelepororolam.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/xukodari.pdfIn PDF document text
    • http://igoscandinavia.com/vampire_bibleb2fdn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394061/normal_5fc8b3f0e1786.pdfIn PDF document text
    • http://the-job.ru/oster_golden_a5_owners_manualgltv8.pdfIn PDF document text
    • https://beveroseve.weebly.com/uploads/1/3/5/3/135316004/mobuzabada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459062/normal_5fde4d7d310ed.pdfIn PDF document text
    • http://airbin.top/what_types_of_food_production_processes_use_enzymes6x0ud.pdfIn PDF document text
    • http://upsbox.ru/65890874983yrtxe.pdfIn PDF document text
    • https://cdn.sqhk.co/papedajapej/bqfsJgg/planet_earth_2_cities.pdfIn PDF document text
    • https://cdn.sqhk.co/wafexumu/Lgf9MLL/xadawefoboduwuwis.pdfIn PDF document text
    • https://cdn.sqhk.co/binisomomup/eicjgvf/amazon_gutschein_einlosen_funktioniert_nicht.pdfIn PDF document text
    • https://munefetuwavebif.weebly.com/uploads/1/3/2/6/132683017/3445137.pdfIn PDF document text
    • http://gtmedis.com/razer_blackwidow_gaming_keyboard_reviewcx8nh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_60205349c727a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471234/normal_6026b1dc8459d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1880934d-8f97-4192-8af3-7fc4dd733453/tixaronopafeseguvejakunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc0920ef-a25f-48da-8b30-ef9682ef6b25/2003_yamaha_kodiak_400_oil_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6a335b-0e74-43f7-a1c8-272cc92ce2cc/61074417427.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 5052 bytes
SHA-256: a95378eb62692cf854fdc1c47452b2e21c4328f52c4d81c0e1e5b738e648fb43
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 11176 bytes
SHA-256: 2652097bdb54fb2fb8cb366e6a2215d8330aa2cca3f2481ffdba549533adc717